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import { last } from "../../clientUtils/Util"
import { ColorScheme } from "./ColorScheme"
import { getLeastUsedColor } from "./ColorUtils"
type CategoryId = string
export type CategoricalColorMap = Map<CategoryId, Color>
export type CategoricalColorMapReadonly = ReadonlyMap<CategoryId, Color>
export interface CategoricalColorAssignerProps {
colorScheme: ColorScheme
invertColorScheme?: boolean
/** The custom color mappings (most likely author-specified) to use. */
colorMap?: CategoricalColorMap
/**
* A cache for custom colors or automatically selected colors for each identifier
* encountered.
*
* In the Grapher, this is persisted across charts, so that a line chart
* that turns into a bar chart will have a matching color scheme across
* both states.
*/
autoColorMapCache?: CategoricalColorMap
}
/**
* Assigns custom categorical colors, e.g. specified by an author for entities or variables.
*
* When an identifier doesn't have an assigned color, it uses the least used color in the scheme.
*
* Keeps a cache so that identical identifiers are assigned consistent colors. See
* Grapher#seriesColorMap for an example of a cache.
*/
export class CategoricalColorAssigner {
private colorScheme: ColorScheme
private invertColorScheme: boolean
private colorMap: CategoricalColorMapReadonly
private autoColorMapCache: CategoricalColorMap
constructor(props: CategoricalColorAssignerProps) {
this.colorScheme = props.colorScheme
this.invertColorScheme = props.invertColorScheme ?? false
this.colorMap = props.colorMap ?? new Map()
this.autoColorMapCache = props.autoColorMapCache ?? new Map()
}
private get usedColors(): Color[] {
const merged: CategoricalColorMap = new Map([
...this.autoColorMapCache,
...this.colorMap,
])
return Array.from(merged.values())
}
private get availableColors(): Color[] {
// copy the colors array because we might need to reverse it
const colors = last(this.colorScheme.colorSets)?.slice() ?? []
if (this.invertColorScheme) colors.reverse()
return colors
}
private get leastUsedColor(): Color {
const leastUsedColor = getLeastUsedColor(
this.availableColors,
this.usedColors
)
// TODO handle this better?
if (leastUsedColor === undefined) {
console.trace("Least used color is undefined, using black.", {
availableColors: this.availableColors,
usedColors: this.usedColors,
})
}
return leastUsedColor ?? "#000"
}
assign(id: CategoryId): Color {
let color = this.colorMap.get(id)
if (color === undefined) color = this.autoColorMapCache.get(id)
if (color === undefined) color = this.leastUsedColor
this.autoColorMapCache.set(id, color)
return color
}
}
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